A shimmering patch of light as big as Sweden detected at the north pole of Saturn is the spectacular result of a giant stream of electrically charged particles from the planet's moon Enceladus, scientists find.Full story

Just a few months after scientists presented tantalizing evidence of ice volcanoes reshaping the surface of Titan, the largest moon of Saturn, a new study is throwing some cold water on the prospect. Full story

Saturn is sending astronomers mixed signals — radio signals, that is. NASA's Cassini spacecraft recently found that the natural radio wave signals coming from the giant planet differ in the northern and southern hemispheres, a split that can affect how scientists measure the length of a Saturn day. Full story

Radar imagery from the Cassini spacecraft provides the data for a virtual flight over Saturn's moon Titan, while Cassini's camera catches the shadow of another moon passing over Saturn's rings. Msnbc.com's Alan Boyle reports.

This Dec. 24 picture from the Cassini orbiter shows a huge storm on Saturn as a bright-colored whirl on the planet's disk. The uncalibrated raw image, released today, also shows the dark shadows of Saturn's rings on the disk.

A ridge that follows the equator of Saturn's moon Iapetus gives it the appearance of a giant walnut. The ridge, photographed in 2004 by the Cassini spacecraft, is 100 kilometers wide and at times 20 kilometers high. (The peak of Mount Everest, by comparison, is 5.5 miles above sea level.) Scientis